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<h2>Events</h2>
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<tr><td style="width: 30%;"><font color="DarkBlue">OnProgress</font></td><td>Search progress callback. It is of type:
<pre>
  TATStreamSearchProgress = procedure(
    const ACurrentPos, AMaximalPos: Int64;
    var AContinueSearching: Boolean) of object;
</pre>
ACurrentPos: current search position,<br>
AMaximalPos: maximal search position,<br>
AContinueSearching: if set to False then search will be stopped.</td></tr>
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